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<title>无标题文档</title>
<script type="text/javascript">
 var points = [{x:2,y:1},{x:3,y:3}];
 points.dist = function(){
	 var p1 = this[0];
	 var p2 = this[1];
	 var a = p1.x - p2.x;
	 var b = p1.y - p2.y;
	 return a - b;
	 return Math.sqrt(a*a+b*b);
 };
 alert(points.dist());
</script>
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